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| the tiny, microscopic building blocks of all living things. |
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| the boundary that surrounds a cell and controls which substances can enter or leave the cell |
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| a stiff structure that surrounds and protects a cell; found in plant, fungus, and some bacteria cells |
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| the gel-like material that surrounds the internal parts of a cell |
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| a part of a cell that directs all cell activities and carries information for cell reproduction |
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| an organelle that makes food from sunlight, water and carbon dioxide |
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| a device that magnifies small items; used by scientists to observe extremely small objects or organisms |
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| consisting of many cells. Humans are this. |
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| a single-celled or multi-cellular organism that may share characteristics with plants, fungi, and animals |
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| an organism that is too small for people to see with only their eyes.Also called "microbe". |
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| a kingdom of organisms, with a nucleus, that get nutrients by decomposing other organisms |
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| tiny, single-celled organisms that do not have a nucleus |
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| Common cause of infectious disease. It is not an organism because it is not made of cells. Contains genetic instructions to take over a cell's normal instructions. |
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